Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy Thirty-five-component electronics kit extending the

Thirty-five-component electronics kit extending the Electronics System 1 set with capacitors

Free-standing life-size male urinary tract model exposes kidneys

the larger geometry pushing pole separation wide enough that field lines extend visibly beyond the magnet body for filing maps

Alternate-model 75mm double-convex glass lens at 300mm focal length

bending measurably under heat as differential thermal expansion of the two bonded metals drives the visible curvature

Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy Thirty-five-component electronics kit extending theCast iron 500g mass carries a retractable hook for suspension from spring scales, pulleys, or beams, serving as a replacement piece for gravitational and force measurement setups.